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Non-traditional sources of proteins and their potential applications
Kubisová, Petra ; Fialová, Lenka (referee) ; Skoumalová, Petra (advisor)
This bachelor thesis is focused on choosing the non-traditional sources of proteins, their characterization and subsequently its potential applications in diet of sportsmen. The theoretical part is focused on specification of importance of proteins in nutrition, description of different available protein supplements for sportsmen and essential characterization of chosen samples. The practical part of this bachelor thesis is focused on analysis of proteins, sacharides and lipids in samples. Nutritional components were analysed by different methods such as spectrophotometric methods, electrophoresis, gas chromatography etc.
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Bioavailability of magnesium and zinc from food supplements
Lindovský, Patrik ; Křikala, Jakub (referee) ; Diviš, Pavel (advisor)
This bachelor's thesis deals with the analysis of dietary supplements containing magnesium and zinc. The analysis examined the content of active substance and solubility in simulated gastric acid. The method used to analyze the active substance content was inductively coupled plasma optical emission spectrometry. This method was also used to determine the degree of solubility of the active substances. A total of thirteen different samples of dietary supplements were examined, all of which contained magnesium as the active ingredient and four of these samples additionally contained zinc. All samples contained the declared amount of magnesium. The zinc amount in food supplements was in accordance with the content stated on the label. In some samples the amount of zinc was determined to be lower, but the deviation from the declared amount did not exceed 14 %. Solubility tests have shown that some products do not contain a suitable type of coating to protect the active substance, which may cause a deterioration in bioavailability.
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Effective components of dietary supplements and their relation to treatment of illness.
Brummer, Vladimír ; Zemanová, Jana (referee) ; Vránová, Dana (advisor)
This bachelor’s thesis is aimed at effective components of dietary supplements in relation to prevention and treatment of civilization illnesses. In thesis are defined basic terms as food supplement, dietary supplement and more. In particular chapters are described characteristics of civilization illnesses and metabolic, physiologic and other changes that are coincidental sign of these diseases. Mentioned are also risk factors of illnesses and summarized dietary and other recommendations to prevent outbreak of disease, or to delay its formation. To each civilization disease are assigned dietary supplements that were studied as prospective effective compounds in prevention and cure of these illnesses. The goal was to summarize and well-arrange available informations related to given theme from various information sources.
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Recipe of a food supplement based on bioactive substances isolated from Prunus spinosa
Červinková, Zuzana ; Hudečková, Helena (referee) ; Kovalčík, Adriána (advisor)
Blackthorn fruits (Prunus spinosa) are small blue-purple drupes containing a range of bioactive substances that give them diverse biological effects. They are traditionally used not only in folk medicine, as they are attributed with many preventive and therapeutic effects. The presented master´s thesis deals with the preparation and characterization of an ethanol extract and dietary supplements based on bioactive substances isolated from the fruits of blackthorn. The ethanol extract was prepared by maceration fresh Prunus spinosa fruits in 40% alcohol. The extract was analyzed for the polyphenols (2111.39±11.32 mg GAE/l), flavonoids (903.89±5.08 mg CAE/l) and anthocyanins (165.24±0.38 mg CGE/l) content, antioxidant (11.99±0.40 mmol TE/l) and antimicrobial activity, phenolic compounds profile and sugars profile. The ethanolic extract exhibited antibacterial effect against the gram-positive bacterium Micrococcus luteus and gram-negative bacterium Escherichia coli but was not effective against the yeast Candida glabrata. After gentle concentration on a vacuum evaporator, the extract was used to prepare a dietary supplement. Two types of dietary supplements were prepared, namely gelatine candies with blackthorn fruit extract and gelatine capsules filled with lyophilized fruit powder. The nutritional profile of these products, content of bioactive substances (i.e. total polyphenols, flavonoids, and anthocyanins), phenolic compound profile and antioxidant activity were characterized. Additionally, the release of polyphenols was monitored during a simulated in vitro digestion. The gelatine candies with different extract concentrations (5, 10, 15 and 20 %) were subjected to sensory evaluation, where the aim was to optimize the addition of the extract to the gelatine matrix. According to the preferences of the evaluators, the sample with 15 % extract was rated as the best in terms of overall taste. In the ranking test, this sample was ranked second, behind the sample with 5 % extract, which, on the other hand, received a worse sensory profile rating. The thesis also included monitoring the effect of freezing, lyophilization, and drying on the bioactive compounds content (i.e. total polyphenols, flavonoids, anthocyanins) and antioxidant activity of Prunus spinosa fruits. The highest contents of total polyphenols (57.49±0.33 mg GAE/g DW), flavonoids (45.75±0.12 mg CAE/g DW) and anthocyanins (6.41±0.19 mg CGE/g DW) were quantified in lyophilized fruits, but the highest antioxidant activity (281.72±0.70 mol TE/g DW) was observed in frozen fruits. A statistically significant moderately strong positive correlation (0.641) of antioxidant activity and total flavonoids was observed for the analyzed samples. The results of the thesis showed a great potential for the use of blackthorn berries in the nutraceutical industry, where they can contribute as active additives to increasing both the bioactive and nutritional quality of dietary supplements.
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Bioavailability of magnesium and zinc from food supplements
Lindovský, Patrik ; Křikala, Jakub (referee) ; Diviš, Pavel (advisor)
This bachelor's thesis deals with the analysis of dietary supplements containing magnesium and zinc. The analysis examined the content of active substance and solubility in simulated gastric acid. The method used to analyze the active substance content was inductively coupled plasma optical emission spectrometry. This method was also used to determine the degree of solubility of the active substances. A total of thirteen different samples of dietary supplements were examined, all of which contained magnesium as the active ingredient and four of these samples additionally contained zinc. All samples contained the declared amount of magnesium. The zinc amount in food supplements was in accordance with the content stated on the label. In some samples the amount of zinc was determined to be lower, but the deviation from the declared amount did not exceed 14 %. Solubility tests have shown that some products do not contain a suitable type of coating to protect the active substance, which may cause a deterioration in bioavailability.
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Qulity of lipids in foods
Křivohlavá, Renata ; Doležal, Marek (advisor) ; Tvrzická, Eva (referee)
The title of the work is "Quality of lipids in food". The work is divided into two parts. The first is theoretical, the other is experimental. The theoretical part is divided into two chapters. The first section describes general chemical composition and properties of lipids. This point is further divided into four sections, which are specifically focused on different groups of lipids. The second theoretical point of attention is focused on the importance of fat in the diet, the synthesis of fatty acids, lipid digestion and issues related to absorbancy and lipid transport. This section also contains a passage which refers to further dietary recommendations, among which highlights the question of the proper quantity and quality of fat contained in food. There are not omitted principles of proper use and storage of fat. The last section of this section deals with dietary supplements and functional foods from which the positive effect on human health is expected. The experimental part is based on chemical analysis of twenty samples of dietary supplements containing n-3 fatty acids. These fatty acids play a vital role in the prevention and treatment of many diseases, especially myocardial infarction or ischemic heart disease. In the screening of these products, attention was focused on the content of...
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Non-traditional sources of proteins and their potential applications
Kubisová, Petra ; Fialová, Lenka (referee) ; Skoumalová, Petra (advisor)
This bachelor thesis is focused on choosing the non-traditional sources of proteins, their characterization and subsequently its potential applications in diet of sportsmen. The theoretical part is focused on specification of importance of proteins in nutrition, description of different available protein supplements for sportsmen and essential characterization of chosen samples. The practical part of this bachelor thesis is focused on analysis of proteins, sacharides and lipids in samples. Nutritional components were analysed by different methods such as spectrophotometric methods, electrophoresis, gas chromatography etc.
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Qulity of lipids in foods
Křivohlavá, Renata ; Doležal, Marek (advisor) ; Tvrzická, Eva (referee)
The title of the work is "Quality of lipids in food". The work is divided into two parts. The first is theoretical, the other is experimental. The theoretical part is divided into two chapters. The first section describes general chemical composition and properties of lipids. This point is further divided into four sections, which are specifically focused on different groups of lipids. The second theoretical point of attention is focused on the importance of fat in the diet, the synthesis of fatty acids, lipid digestion and issues related to absorbancy and lipid transport. This section also contains a passage which refers to further dietary recommendations, among which highlights the question of the proper quantity and quality of fat contained in food. There are not omitted principles of proper use and storage of fat. The last section of this section deals with dietary supplements and functional foods from which the positive effect on human health is expected. The experimental part is based on chemical analysis of twenty samples of dietary supplements containing n-3 fatty acids. These fatty acids play a vital role in the prevention and treatment of many diseases, especially myocardial infarction or ischemic heart disease. In the screening of these products, attention was focused on the content of...
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Effective components of dietary supplements and their relation to treatment of illness.
Brummer, Vladimír ; Zemanová, Jana (referee) ; Vránová, Dana (advisor)
This bachelor’s thesis is aimed at effective components of dietary supplements in relation to prevention and treatment of civilization illnesses. In thesis are defined basic terms as food supplement, dietary supplement and more. In particular chapters are described characteristics of civilization illnesses and metabolic, physiologic and other changes that are coincidental sign of these diseases. Mentioned are also risk factors of illnesses and summarized dietary and other recommendations to prevent outbreak of disease, or to delay its formation. To each civilization disease are assigned dietary supplements that were studied as prospective effective compounds in prevention and cure of these illnesses. The goal was to summarize and well-arrange available informations related to given theme from various information sources.
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